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POHow to draw shape by right clicking a panel in Swing?
 

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  1. POHow to draw shape by right clicking a panel in Swing?
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    <p>I am trying to create a swing program. In my program I want to achieve something like this: right click on a panel and select the menu "Draw rectangle" and program should draw a very simple rectangle on the panel. Here is my code:</p> <pre><code>import java.awt.*; import java.awt.event.*; import javax.swing.*; import javax.swing.border.BevelBorder; public class MainWindow extends JFrame { JFrame frame = null; AboutDialog aboutDialog = null; JLabel statusLabel = null; //label on statusPanel public MainWindow() { frame = new JFrame("Project"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); //MENUS JMenuBar menuBar = new JMenuBar(); //menubar JMenu menuDosya = new JMenu("Dosya"); //menus on menubar JMenu menuYardim = new JMenu("Yardım"); //menus in menus menuBar.add(menuDosya); menuBar.add(menuYardim); JMenuItem menuItemCikis = new JMenuItem("Çıkış", KeyEvent.VK_Q); //dosya menus menuItemCikis.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent event) { System.exit(0); } }); menuDosya.add(menuItemCikis); JMenuItem menuItemYardim = new JMenuItem("Hakkında", KeyEvent.VK_H); //hakkinda menus menuItemYardim.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent event) { JDialog f = new AboutDialog(new JFrame()); f.show(); } }); menuYardim.add(menuItemYardim); frame.setJMenuBar(menuBar); //TOOLBAR JToolBar toolbar = new JToolBar(); JButton exitButton = new JButton("Kapat"); toolbar.add(exitButton); //STATUSBAR JPanel statusPanel = new JPanel(); statusPanel.setBorder(new BevelBorder(BevelBorder.LOWERED)); frame.add(statusPanel, BorderLayout.SOUTH); statusPanel.setPreferredSize(new Dimension(frame.getWidth(), 20)); statusPanel.setLayout(new BoxLayout(statusPanel, BoxLayout.X_AXIS)); statusLabel = new JLabel("Ready."); statusLabel.setHorizontalAlignment(SwingConstants.LEFT); statusPanel.add(statusLabel); //MAIN CONTENT OF THE PROGRAM final JPanel mainContentPanel = new JPanel(); //RIGHT CLICK MENU final JPopupMenu menuSag = new JPopupMenu("RightClickMenu"); JMenuItem menuRightClickRectangle = new JMenuItem("draw rectangle"); menuRightClickRectangle.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent event) { //CircleShape cs=new CircleShape(); mainContentPanel.add(new CircleShape()); //trying to draw. mainContentPanel.repaint(); //mainContentPanel.repaint(); boyle olacak. } }); JMenuItem menuRightClickCircle = new JMenuItem("Daire çiz"); menuSag.add(menuRightClickRectangle); menuSag.add(menuRightClickCircle); mainContentPanel.addMouseListener(new MouseAdapter() { public void mouseReleased(MouseEvent e) { if (e.getButton() == MouseEvent.BUTTON3) { menuSag.show(e.getComponent(), e.getX(), e.getY()); statusLabel.setText("X=" + e.getX() + " " + "Y=" + e.getY()); } } }); JButton west = new JButton("West"); JButton center = new JButton("Center"); JPanel content = new JPanel(); //framein icindeki genel panel. en genel panel bu. content.setLayout(new BorderLayout()); content.add(toolbar, BorderLayout.NORTH); content.add(statusPanel, BorderLayout.SOUTH); content.add(west, BorderLayout.WEST); content.add(mainContentPanel, BorderLayout.CENTER); frame.setContentPane(content); frame.setPreferredSize(new Dimension(400, 300)); frame.setLocationRelativeTo(null); frame.pack(); frame.setVisible(true); } } </code></pre> <p>The problem is nothing is drawn on the panel. I guess there is an event loss in the program but i don't know how to solve this issue.</p>
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    1. COConsider using a `BufferedImage` as in [this example](http://stackoverflow.com/a/12216139/418556).
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    2. COOr this object drawing [example](http://stackoverflow.com/a/11944233/230513).
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